According to Release Group / Type - MusicBrainz that seems correct as compilation as it is written that not only pre-recorded music constitutes a compilation but also newly made recordings by different artists that create an album with a common theme. Or am I interpreting it the wrong way?
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All the examples of common themes are mostly the kind of pre-existing recording compilations, though (Songs for Lovers, Hits of 1998, Songs From the Movies).
And maybe remix for the last one (Café del Mar) (I don’t know this).
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I (wrongly) interpreted it that way too, that’s why this discussion started 
It may change or be clearer, more examples of what is and what isn’t a compilation will help once that is decided
I just notice the artist Various Artists has the disambiguation (add compilations to this artist)
This sounds wrong to me, shouldn’t it be something in the line of: (use for releases with no clear release artist, and featuring different track artists)?
As not every VA release is a compilation, and not every compilation is a VA release.
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The point is that there are other artists called “Various Artists” (at least four) that are just normal artists with a dumb-funny name, rather than the actual “Various Artists” artist. That’s why that disambiguation is there, just as a quick way of indicating “this is the various-artists Various Artists”. We could change it a bit, but it should be something short and to the point, which your suggestion isn’t.
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Yes, my suggestion is indeed very long for a disambiguation…, almost a complete guide. It’s hard to come up with something short that doesn’t pose a similar problem as the existing one.
I wonder, is there a reason this is not in the DB as [various] or [various artists], similar to [no artist], [unknown artist], [traditional], etc.?
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That’s been suggested and the main reason I haven’t changed it so far is that it would cause so many changes in one go that it might break stuff 
Such as our search server indexes and other similar things. Might need to go for it at some point though. Admittedly, that might make it even more likely for inattentive users to select one of the wrong Various Artists 
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